/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.hadoop.hive.ql.exec;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hive.ql.metadata.HiveException;
import org.apache.hadoop.hive.ql.plan.DynamicValue;
import org.apache.hadoop.hive.ql.plan.ExprNodeDynamicValueDesc;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspectorUtils;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspectorUtils.ObjectInspectorCopyOption;

/**
 * ExprNodeDynamicEvaluator.
 *
 */
public class ExprNodeDynamicValueEvaluator extends ExprNodeEvaluator<ExprNodeDynamicValueDesc> {

  transient ObjectInspector oi;

  public ExprNodeDynamicValueEvaluator(ExprNodeDynamicValueDesc expr, Configuration conf) {
    super(expr, conf);
    oi = ObjectInspectorUtils.getStandardObjectInspector(expr.getWritableObjectInspector(), ObjectInspectorCopyOption.WRITABLE);
  }

  @Override
  public ObjectInspector initialize(ObjectInspector rowInspector) throws HiveException {
    return oi;
  }

  @Override
  protected Object _evaluate(Object row, int version) throws HiveException {
    DynamicValue dynamicValue = expr.getDynamicValue();
    dynamicValue.setConf(conf);
    return dynamicValue.getWritableValue();
  }

}
